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生物质炭巨大的活性表面,可吸附土壤中的硝酸根等阴离子养分。采用竹炭作为试验材料,以自然土壤和人为耕作土壤为试验土壤,用硝酸钾溶液浇施模拟施肥,通过离子色谱测定浇施后所得滤液中硝酸根离子的含量,分析竹炭对土壤中硝酸根离子的吸附效果。试验设计如下:自然土壤加入的竹炭百分比为0,1%,2%,3%,4%(竹炭直径<1 mm),耕作土壤加入的竹炭百分比为0,1%,3%,5%(竹炭直径为1~2 mm),2种竹炭颗粒(1~2 mm和<1 mm)比较试验时加入的竹炭量为3%。结果表明:土壤中加入竹炭对硝酸根离子的吸附有一定的作用,前2次淋洗表现为吸附作用随着竹炭比例的增加而增强,但只有加入的竹炭量超过3%后,吸附效果没有显著提高(P>0.05)。在加入等量(3%)竹炭时,前2次淋洗时颗粒直径为1~2 mm的竹炭吸附效果好于<1 mm的竹炭,细粒与对照没有差异,第3次淋洗时竹炭处理与对照差异显著(P<0.05),但不同颗粒之间差异消失。竹炭的施入比例和颗粒直径均能影响其对土壤中阴离子的吸附效果。建议生产上采用3%比例、颗粒直径为1~2 mm的竹炭,以减少硝酸根离子的淋失。
The huge active surface of biomass charcoal can adsorb anion nutrients such as nitrate in the soil. Bamboo charcoal was used as test material. Soil was used as test soil with natural soil and man-made tillage. Potassium nitrate solution was applied to simulate fertilization. The content of nitrate ion in the filtrate was determined by ion chromatography. The effect of bamboo charcoal on nitrate ion The adsorption effect. The experimental design was as follows: The percentage of bamboo charcoal added to soil was 0,1%, 2%, 3% and 4% (charcoal diameter <1 mm) Bamboo charcoal diameter of 1 ~ 2 mm), two bamboo charcoal particles (1 ~ 2 mm and <1 mm) compared to the amount of bamboo charcoal added when the amount of 3%. The results showed that adding bamboo charcoal into the soil had a certain effect on the adsorption of nitrate ions. The first two leaching showed that the adsorption increased with the increase of the proportion of bamboo charcoal, but only when the content of bamboo charcoal exceeded 3%, the adsorption did not Significantly increased (P> 0.05). When bamboo charcoal with the same amount (3%) was added, the charcoal adsorption efficiency of charcoal with particle diameter of 1 ~ 2 mm in the first 2 times of rinsing was better than <1 mm bamboo charcoal with no difference between the fine granules and the control. The difference between treatment and control was significant (P <0.05), but the differences between different particles disappeared. Bamboo charcoal application rate and particle diameter can affect its adsorption of soil anions. Proposed to use the production of 3% of the proportion of particle diameter of 1 ~ 2 mm of bamboo charcoal to reduce nitrate leaching.